package com.dafeng.interfacetest.h2.starter;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * 获取spring容器中所有bean的工具类，（比如接口为UserService，生成的bean为userService，默认小写）
 */

/**
 * spring 上下文工具类
 */
@Component
public class ApplicationContextUtils implements ApplicationContextAware {
  
    /**
     * 上下文对象实例
     */
    private static ApplicationContext applicationContext;
  
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    	System.out.println("测试启动类");
        ApplicationContextUtils.applicationContext = applicationContext;
    }
  
    /**
     * 获取applicationContext
     *
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
  
    /**
     * 通过name获取 Bean.
     *
     * @param name
     * @return
     */
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }
  
    /**
     * 通过class获取Bean.
     *
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }
  
    /**
     * 通过name,以及Clazz返回指定的Bean
     *
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }
}
